1and1 email issue: 550 invalid DNS MX or A/AAAA resource record

[GREED]

Personal request for help.

 

I have an email address through my own domain, via 1and1 (Ionos). Don't think I have messed too much with the DNS records, but suddenly I am getting the following error when sending to a specific, new, email recipient:

 

550 invalid DNS MX or A/AAAA resource record

 

I don't know anywhere near enough about DNS records to be able to understand if this is an issue my end, or how to resolve.

 

Any ideas?

[jthompson]

It looks like a problem with the DNS records of the recipient's domain. Try entering the recipient domain into https://mxtoolbox.com/ to see what it throws up.

[Steve21]

With IONOS that's normally a sender error rather than receiver (in their eyes at least - The sender domain of the email server you are using is not configured in the domain name service (DNS) in accordance with RFC.) - Unless both users at on IONOS?

 

Which domain is it? If you don't mind saying?

 

Steve

Edited June 27, 2020 by Steve21

[GREED]

With IONOS that's normally a sender error rather than receiver (in their eyes at least - The sender domain of the email server you are using is not configured in the domain name service (DNS) in accordance with RFC.) - Unless both users at on IONOS?

 

Which domain is it? If you don't mind saying?

 

Steve

My domain is omegapegasus.com

 

Yes I read that comment too but I don't understand what that means or what to do about it. From what I can see and work out DNS settings are all correct I have not changed anything.

[Guest Guest]

Your MX records look fine. Is the new recepient on your domain? If not that would suggest the issue is with the recipient's mx records

[GREED]

Your MX records look fine. Is the new recepient on your domain? If not that would suggest the issue is with the recipient's mx records

No it is a totally separate contact. New too. Emails have been fine elsewhere to everyone else, which has led me to believe this is a problem their end.

 

I've subsequently tried sending via my personal gmail, that seems to have been fine (at least not had any bounce). Others can send to this address fine (contacts I know).

[Steve21]

Those errors are only IONOS based ones though as it's internal messages.

 

Out of curiosity I take it you aren't doing anything like sending emails with prefixes? Like [email protected] or something that you don't have a MX listed for?

 

Steve

[GREED]

No, basic email address [email protected]

 

As I say it is fine for every other address I am sending to.